Question

Determina la m de 245g de Na2SO4 en 900g de disolvente

Answer 1

Mm Na2SO4 = 142  g/mol

mol = masa / Mm

molalida = mol soluto / Kg svte

 mol= 245 g / 142 g/mol = 1.725 mol

svte = 900 / 1000 = 0.900 Kg

m = 1.725 mol / 0.900 Kg

m = 1.916 mol/Kg